public class StopWatch {
	private long _startTime;
	private long _duration; // in milliseconds
	

	public StopWatch(){
		_startTime = 0;
		_duration = 0;
	}
	
	public long getMilliSeconds(){
		return _duration;
	}
	
	public void startTimer(){
		_duration = 0;
		_startTime = System.currentTimeMillis();
	}
	
	public void stopTimer(){
		_duration = System.currentTimeMillis() - _startTime;
	}
}